(19)
(11) EP 0 611 208 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.07.1995 Bulletin 1995/29

(43) Date of publication A2:
17.08.1994 Bulletin 1994/33

(21) Application number: 94400272.4

(22) Date of filing: 09.02.1994
(51) International Patent Classification (IPC)5: G11B 21/08, G11B 5/596
(84) Designated Contracting States:
DE FR GB

(30) Priority: 09.02.1993 JP 44644/93

(71) Applicant: SONY CORPORATION
Tokyo (JP)

(72) Inventors:
  • Takeda, Toru, c/o Sony Corporation
    Tokyo (JP)
  • Hayashi, Nobuhiro, c/o Sony Corporation
    Tokyo (JP)
  • Yamamoto, Noriyuki, c/o Sony Corporation
    Tokyo (JP)

(74) Representative: Thévenet, Jean-Bruno et al
Cabinet Beau de Loménie 158, rue de l'Université
75340 Paris Cédex 07
75340 Paris Cédex 07 (FR)


(56) References cited: : 
   
       


    (54) Information storage disc and information recording and reproducing apparatus


    (57) The information storage disc has ID storage areas (41H) formed in predetermined locations in the radial direction of the disc, the ID storage areas storing either sector or track numbers (resp. 40,41) previously and magnetically. In this setup, if the read head (30) is dislodged from the center line of a given track (10), the read head still reads the sector number correctly. The information recording and reproducing apparatus has the read head (30) and the write head (31) arranged so that they are positioned on a given intermediate track in a substantially aligned manner. With the write head positioned on a given track, the read head is dislodged from that track only by a negligible distance. This allows the read head to read sector and track numbers unfailingly from the disc.






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